A Turkish diplomatic source said investigators would inspect the consulate on Monday afternoon, following delays last week when the two countries agreed to work together to find out what happened to Khashoggi, a critic of the Kingdom's policies.
"There needs to be a credible investigation to establish the truth about what happened, and - if relevant - to identify those bearing responsibility for the disappearance of Jamal Khashoggi, and ensure that they are held to account", the countries said in a joint statement. "I am immediately sending our Secretary of State to meet with King!" the president tweeted Monday. No proof has emerged that he ever left the Saudi consulate, and despite the Saudis insisting that he did leave their building, they have offered no evidence that he did.
Saudi dissident Jamal Khashoggi wrote for The Washington Post, and he was one of the loudest voices in America against the brutal Saudi Arabian regime.
But White House economic adviser Larry Kudlow says the conference will deal with terrorist financing and how to stop it, and that "at the moment", Mnuchin intends to go.
Saudi Arabian equities slumped as much as 7% Sunday on concern over possible United States measures.
Trump threatened Riyadh on Saturday with "severe punishment" if Khashoggi, a contributor for the Washington Post who has been critical of Crown Prince Mohammed bin Salman, was killed inside its Istanbul consulate.
Roger Diwan, a veteran OPEC watcher at consultant IHS Markit Ltd., said the Saudi comments broke "an essential oil market taboo" and could be self-defeating.
"Whether by waving economic sanctions, using political pressure, or repeating false accusations that will undermine the Kingdom", Saudi officials said in a statement, they would "respond with greater action".
Sens. Marco Rubio and Jeff Flake, members of the Foreign Relations Committee, have said Congress is prepared to move quickly and firmly if Trump fails to adequately respond to Khashoggi's disappearance.
The statement did not directly acknowledge Khashoggi's disappearance, which happened October 2 when he visited the Saudi Consulate in Istanbul.
"The center has followed the blunt campaign against Saudi Arabia in a cheap attempt to discredit its reputation, spread rumors and jump to conclusions based on no facts", the head of the Center for Islamic Call for Latin America and the Caribbean Ahmed Bin Ali Al-Saifi said in a press release.
A Saudi delegation arrived in Turkey on Friday to discuss the case with Turkish authorities, following a Turkish presidential spokesperson's announcement that a joint Turkish-Saudi investigation team would be formed upon the kingdom's request.
Google Cloud CEO Diane Greene joined the increasing list of prominent USA technology and business executives distancing themselves from the Saudi Arabian government's Future Investment Initiative, an event that has been overshadowed by reports of the government's role in executing a journalist.